As far as I am aware, yes, Win 7 will still be available, approximately until around October 2013 for retail, and October 2014 for OEMs. If you are interested in building a Win 7 machine, why not buy your copy now while you're thinking about it? It will be supported by updates until January 14, 2020.
First off, thank you for the reply...and that is awesome news! It will be interesting to see how this plays out. If Win8 becomes Vista 2.0, then I'm certain Win7 will be available - probably even after 2014. If, however, it gets even a warm reception, I'm certain MS will highly "encourage" retailers like Newegg or Micro Center to pull remaining copies of Win7. Only time will tell.
FYI, I do have a copy of Win7 (just in case), but with family members want new computers...and I was thinking on building a couple computers next year for my benefit...let's say I didn't want to needlessly stock pile OEMs of Win7. Not to mention, Win8 may be better than anticipated - at which point I'll probably want to try out Win8.
BTW, I just got an upgrade version of Win8 Pro from Micro Center for $43 (including tax) - so I'm set there too!