well, the only real information that I trust on this is gaspart saying that there will be very few signings. Which I take to mean 1-2. The mendieta rumors seem credible, as do the Lucio ones.
Mendieta+Lucio+current team would be a formidable squad, and make us alot better than last year. Most importantly it would add mental toughness of mendieta.
Finally, the rivaldo rumors are still flying. If he continues to play well (scored in every game, two MoM awards, etc) all the way into the final, then I suspect he will be sold. If he has a great performance against england, then it is even more likely, that some english team would buy him. I expect that Rivo would be more likely to approve a switch to the premiership, because he is less likely to be injured there. Also, given how fanatical the english media is, its possible an english club would overpay for him, ie 40mill euros.
all the other 'young' unproven players seem to have faded out of the picture as far as incoming transfers go.