Paul with no real info out there, what is worth waiting for? Finding out if they actually change like the mention, or finding out you waited for something that is basically already out? If the company makes the changes, it would be smart to wait for a lighter more agile STI. But like Mosc said, the STI might be on hiatus for a year with all the changes.
So to the OP if you think you need one now, or want it that bad, and you can get what you want, I see no reason to prolong it. Go out and test drive yourself a few and see what fits you, and move from there.
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX