depends on which are you talking about and which are going to be equipping the new macs, we have
4400 - ULV only, however we have some ULVs with the 5100
4600 - currently we know they are in some quads
5100 - we know they are in som ULVs, its probable we will see them in 37w cpus as well
5200 - cream of the crop it comes with the most powerful core and with embedded ram so that the gpu doesnt starve that much (its going to be only 128mb after all), and this is the one that appeared in the youtube video. We know its going to appear in 2 quads, in all probability its going to appear in more cpus across the entire range as well (minus the Y series, since its for 11w or something of tdp)
Tom did a review of the 4600, and its around 20-30% better than the 4000 (in the 2 games tested 10fps of difference is good but not enough), we expect a lot more from the 5200, since its double the cores along the embedded ram, thus basically something more than trinity is, probably 30% less than what kaveri can deliver
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Isn't Haswell packaged with the GT3 rather than HD4000?
so depends.
but new arch in igpu, means not using what are they using now, which is this
http://www.anandtech.com/show/6355/intels-haswell-architecture
they are going to make a new arch for the igpu. We dont know what is going to be. its kind like what nvidia and amd do for their gpus, kepler -> maxwell.