Point taken on the pixelation issue - I haven't really played with the iPhone SDK.
However, your comment "If the tablet indeed will come next month, Apple will have a clean headstart here and all the others will eat the dust..." is just plain wrong. Apple will be at least 5 years behind the various Windows OEMs in developing tablets, of which there are loads of convertible tablets and some "slate" (i.e. no keyboard) models on the market.
Take a look at these, for example:
Apple isn't even out of the gate yet and competition is already doing business. And these aren't cut-down OSs - they run full versions of desktop software. That means full support for Photoshop, Dreamweaver, etc. And, given Apple's pricing strategy, it's a fair bet they'll be cheaper than the Apple tablet. Are you seriously suggesting anyone will by an Apple tablet that is more expensive and is running an OS that is essentially designed for a phone, rather than a tablet that runs a full OS, with full software compatibility, that costs less?