Well, we have wireless in certain locations around campus, but the physics building isn't going to get it, at least not any time soon, especially with all of the budget issues that we've got now.
As for whether or not to buy now, I'd recommend that, unless your current computer is satisfactory for the next six months to a year, then don't wait. If you computer is satisfactory for that long, then go ahead and wait. By a year from now I'd guess that the iBooks will either have the 7457 G4 processor, or the 750GX 'Gobi' (G4i?) processor, probably in excess of 1GHz. So, it will be a notably faster computer than you can get now. But, it's a big trade off to be without a satisfactory computer between now and then.
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