I think the big changes are that the Indigo is open and if you haven't gone to ALVA or SKYLAB (The rooftop bar). You are missing out. The big thing is the development around the corner is still moving forward with both RBH Group and Fidelco doing work on Market between University and Mullberry.
As for triangle park there is reason to believe it will happen. The redevelopment agreements on all the owners surrounding the agreement were tied to that park being done and they it forces them to develop their lots. The city is pushing hard for this to happen because it needs the retables from buildings that would surround the arena which are currently parking lots. Boraie seems to have gotten site control on one of the best lots ( rt21, market, Edison and Mullberry) and has started pushing that as where they want to develop instead of Rector.
If you go north of the area, on Broad, things are getting real nice around the new Prudential building with Military park looking fantastic and the new Burg Restaurant opening in there. I have seen a few new restaurants poping up around the new Prudential building so I think the trend of all the things you want to see being on the North side of the area will continue.