Glee "Britney 2.0"

"Britney 2.0" S4 E2 - I don't know if you all are wondering this, but my biggest question is...where have Finn and Mercedes been and I suppose Mike Chang as well?!?!  I am still assuming that they are coming back on the show, but I have not even heard Mercedes mentioned at all!  I'm getting a little worried, since the new Glee members (e.g. Puckerman's brother and new girl) just aren't doing it for me.  The only thing that is making me want to stick around is all the A-list guest stars.  Kurt finally made it to NYC and it seems like things are turning around a little for Rachel.  I'm quite intrigued with this new guy from NYADA and I wonder if her heart still lies with Finn.  There are just too many characters now and I don't think the show is doing them justice in continuing to develop them.  Maybe it's too early on in the season since there has only been 2 episodes?  We've barely seen any interaction from Mr. Shue and what's going on with him and Emma?  How are Blaine and Kurt's relationship surviving long-distance?  McKinley High is certainly not as happenin' as it use to be.  Disappointment in the current Glee season as well? -Cyn