Wher have you been for the last few years!?
OK, the bottom line is that it is obviously completely up to you whether you switch or not...
A couple of things to be aware of..
here are a large number of 2nd edition books out, althuogh several of them are not currently in print but ARE available as electronic PDF from FFG (check the web site). It's not clear from your opst how much 2ed (or 1st ed for that matter) stuff you own, but there is enough 2nd material for you to run/play 2nd for a number of years to come especially if you have only just started playing it.
However, FFG have said they will not be producing any new 2nd ed material and it is not yet clear (to me at least) how much of the 3rd ed material can be converted to 2nd; its clear from what has been said that 2nd and 3rd ed are in different time frames (2nd ed opst storm of chaos/3rd ed seems to be just pre storm of chaos). We actually play 3nd in pre storm of chaos era anyway so if my group do stick with 2nd ed, i don't think this time shift of the fluff material is likely to be a big issue anyway.
There are some concerns about the pricing of the new edition and how to ensure you have enough material for the number of players in your group etc, which you can pick up from the numerous other posts in the forum and I won't reiterate here, there's also a lot of discussion on whether the new rules will be better or worse than the 2nd ed etc, which again i won't reiterate and no one can really judge until we see the 3rd ed in detail.
I think you are in quite a good position (I assume you have only bought a small amount of 2nd ed stuff) in that you can play 2nd ed for now (but don't purchase any new material for it just now) then when 3rd ed comes out, read some indepedent reviews etc and decide whether you think its something you'd like to try or prefer to stick with 2nd ed.
If you decide to stick with 2nd ed, then i would consider picking up the 2nd ed pdfs sharpish, as although they are currently available, I don't think its been made clear how long they will stay available from FFG once 3rd ed is out..
some people consider it free money for FFG, so there is no reason for them to stop the PDFs, but others think that they won't want to "promote" a version that could take gamers (such as yourself) away from their new shiny edition of the game... as for what FFGs plans actually are in this regard, I don't know!
Welcome to warhammer, anyway, whatever edition you end up with!