If an update to the current set is in order, then I have a few ideas I'd like to have considered.
Firstly, Stamina is definitely a key issue with the current set. Whether it is a matter of Arshavin consciously conserving his own energy or a low level of fitness (He himself has proclaimed that he lacks stamina, although he foolishly claims that his lack of it is due to his genetics) it is simply illogical to keep him at a current 83 for Stamina, he simply does not exhibit this standard. Curiously, Arshavin's energy levels seem to ebb and flow over the course of a match; looking tired at certain points then suddenly coming alive with a burst of energy, followed by a period of languish. I would suggest an 80/81 value, putting him as close to Guti as possible.
On a similar note, I would reduce his Response value. Too often does he appear lackadaisical to a loose ball within the box, despite possessing the reasonable level of speed that one would assume would lead to him reaching that ball with ease and the astute positioning that would enable him to reach it. Whether it is a lack of effort on his behalf or a lack of anticipation of the ball's movement is up for a debate, but what remains clear is that he is simply lacking the sharpness that the current value conveys. I believe a drop, similar to that in Stamina, is needed here, bringing him to an ~81 value.
Short Pass Accuracy & Team Work combination is another facet that certainly needs to be taken into consideration. Although Arshavin's assist tally would indicate one of the most proficient passers in the final third (17 in the last season, 11 in the Premier League alone), his passing in game would suggest otherwise. It is not necessarily that he lacks accuracy in his passes, per se, it's that his decision-making is wayward. Too often does Arshavin attempt a square ball around the opposition's box and, as Cruyff-ian philosophy states and Arshavin's example proves, this often leads to an opposing full-back or central defender intercepting the pass and leaving Arshavin and intended team-mate for dead and behind the tempo. As a result of this, we regularly see alarmingly low passing accuracy statistics from his matches (Generally achieving a success rate between 67-72%). The issue here is obviously to find out what values are needed for his SPA and Team Work to necessitate this. My belief is that Team Work is the attribute that needs to see a big reduction; it is largely the decision-making factor in this situation and there are most certainly other reasons to reduce it (Most clearly to a viewer the fact that Arshavin often seems out of sync with his team-mates movement). In this area, I'm under the impression that an 82 might be the value needed for Team Work. As for his SPA, only a slight 1-2 point reduction may be needed.
I also have concerns over his Attack value. Although, as previously mentioned, his positioning within the opposition box can be deadly, it is the influence that his Attack will have on his Dribble Accuracy that concerns me. As we all know, Arshavin's ball control can be mesmerising. He can keep the ball in scenarios where it is seemingly impossible, eluding the ball from the opposing defenders when he is outnumbered 3:1. However, there seems to be an increasing trend in Arshavin's dribbles that would indicate a lack of forethought on where he intends to take the ball. It is not as obvious in Arshavin's dribbles as it is in the dribbles of Walcott or, say, Wright-Phillips, it is an issue that is seemingly becoming more prevalent in his game. I have no suggested value for this, but I do believe that it needs to be scrutinised and discussed.
A reduction in his Shot Accuracy is far too obvious and so pertinent that it needs little discussion. The accuracy of his shots over the course of the last season simply does not merit him having a higher Shot Accuracy than Chamakh or a comparable one to Van Persie (although Van Persie needs a definite raise here, alas that is not relevant right now). A 77/78 kind of value would be my option here.
Similarly, a reduction in his Shot Technique should be discussed. Whilst Arshavin can certainly hit a ball sweetly at times, the frequency of him doing so seems to be getting less and less. Too often have we seen a bizarrely errant shot come from his feet within the box, dragging it high and too powerful or ridiculously wide (There was an interesting example of this against Liverpool on the weekend, in the second half IIRC). I'm not quite certain of a value here, but I feel like an 81 would work.
I also believe that an Agility reduction is needed. He is simply not showing the nimbleness that he has shown in the past, and there have been times where his turning circle has been surprisingly large for a player of his diminutive height and build. I would not say that he should sit so close to Nasri or Pastore, nor would I say that he is superior to Rosicky in this department (In fact, I would even argue that Rosicky is more nimble than Arshavin of late). In this area, I would suggest an 84.
I also believe that his Top Speed, Acceleration, and Dribble Speed needs to go down. I would reduce his Top Speed down an 82 value, his Acceleration to an 85 value (He doesn't quite appear to have that immediate burst off the mark like he used to), and a Dribble Speed dropped by 2 points at the minimum.