Broadway is inferior to Xenon with floating point work but beats it hands down with general processing and integer work. But, again, we have no idea what the strengths and weaknesses of Expresso are, it's a completely different animal.
And with regards to ports, developers will have a much easier time porting between the Wii U/PS4/One than the Wii U/PS3/360 for several reasons:
1) The console architecture of all 3 current gen consoles are very similar. They are all 'GPU heavy' with regards to floating point work whereas the PS3 and 360 are 'CPU heavy'
2) The RAM setup of the Wii U and Xbox One are practically identical
3) The CPUs for all current gen consoles are out-of-order and the CPUs for the PS3 and 360 are in-order
4) The CPUs for the PS3 and 360 handle sound (at least one thread of Xenon and one SPE of Cell is dedicated to audio, a good few games with thousands of sounds at once on the 360 - such as racing games - dedicate an entire core to sound) whereas all 3 current gen consoles have DSPs for audio
Everyone is always harping on about the difference in CPU architecture but developers have been porting between Power based CPUs and x86 CPUs for years without a problem.
Developers are going to have a much easier job porting between the 8th gen consoles than the Wii U/PS3/360, those 4 points above are the reason for poor performance of Wii U ports in comparison to last gen consoles despite the Wii U being much more powerful.
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