Okay. We all have different opinions about this idea of "OH, will we really see this new MB in June?!?" The answer is... we don't know.
That is purely a rumor. If Apple could lag behind a few months on their previous update, so could they with the next one. Maybe with this in mind, Apple might do the same with the release of Moniteva (this June) even LATER! That means we might see this new MB update in Sept or Oct, after the back to school deals. But don't take my word for it, that is only my opinion.
So it's all up to you if you really need it now or not. Ask yourself that, and keep in mind that patience is a virtue...
Okay let me tell you what I'm thinking:
I need a laptop for college so I was at least planning on waiting until the Back to School thing starts. For me I would like an update because if I can wait I might as well, but if they don't update before I need to buy it I will be angry because that is a set of time I could have used to enjoy my new laptop and get it ready for college. So to me its a probability thing, is it worth the gamble to get a better laptop by waiting or risk not getting an update and being able to enjoy it. I know it seems trivial but I hope someone can see it from my point of view. I just don't want my wait to not be worth it. I hate being tied to a desktop all of the time.