I would only think it'd be a "rush" job if it's early fall of this year and it just starts filiming. At this point, we're still a year and a half away from the release date so just relax a little.
And let's not forget that Star Trek XI started shooting in October 2007 for an originally slated Christmas 2008 release date.
^And that they hit that deadline, and the film was pushed down for financial reasons only. So we know they can do it.
I'm sure I read somewhere that while they could have had it done for the Christmas '08 release... Abrams was thankful for the extra time the May '09 date gave them to tweak things.