definitely looks as if Spurs at least plan to use their picks. some of the invited players are likely out of their draft range (Vucevuc, Shumpert), or even definitely out of their range (Morris, Kanter interview).
that might be an indication that they try to move up and/or acquire another 1st round pick. the #18,#19 and #20 pick are or might be on the market (#20 pick from the Wolves definitely is).
if Vucevic is their target, as many here guess, a pick in that range won't be good enough IMO. he is ranked around 20 in most mocks, but I'm pretty sure he will be picked around 10. he just is to talented and offers to much size to pass. and the success of players like Lopez and Monroe will encourage teams to invest a high pick in such a player. I can see him go to Bobcats at #9 for example.
my hope for a pick around #20 is, that Spurs get Tobias Harris. (no workout reported though).