I think it'll be a tougher year for the PS3 in contrast to last year, but I wouldn't say that the 360 has the upper hand completely for the last part of '10.; at least not yet. I'm pretty sure Sony has a lot of games backed up to announce during e3 or some other event(s). I also think this is very much dependent on how well the motion controllers catch on with the people, which, in my opinion, can pretty much go either way.
Also, Gran Turismo 5 comes out during the fall; no way will PS3 sales in Europe fall below 360 sales during the latter half of this year.