Well, Maemo SDK+ is actually painless to install and use: you only have to prepend all your usual build commands with "sb2". But you haven't answered any of my questions! What a pity!
Not sure why I should spend my life syncing with Exchange server. OpenGL may be of some use, especially on a 800x480 screen (iPhone only has 480x320) but if you have not installed an SDK, there is no point lamenting its lack or celebrating its presence. So, back to those three questions.
Well, you pretty much answered your own question. If OMAP3 mass production has not started yet, it is not logical to expect Nokia release a product based on it. Notice that all current Nokia devices come out with OMAP2 right now. It usually takes 6-12 months to switch to a new platform, from the moment the chips go into mass production. You can use Nokia's OMAP1->OMAP2 switch as a reference.