OS4 being shown in the US -- whether on CSPPC or the AmigaOne -- is a positive (and very rare apparently) thing. OS4 being shown, for really the first time in the same place as the Pegasos so that people can get a hands-on with both is a positive thing (for the community).
I will make a prediction. OS4 will not be in such an advanced state as MorphOs (understandably because development started much later). OS4 will not run on AOne (something that we know NOW).
Genesi will have a lot of machines running MorphOS 1.4 on Pegasos while OS4 will be shown on maybe 2 or 3 A4000's.
MophOs users will trash OS4 because they did a more impressive show (normal with their Pegasos and flatscreens and nice cases, t-shirts and eyecandy...), because OS4 feels slower (normal because hardware is slower), because it is in a more advanced state (normal as OS4 dev started much later), because it doesn't run on PPC completely,, because AOne only runs linux,... (all the usual stuff that has been discussed on and on)
Somehow, in their comparison, MorpOS users will forget that the one system is for sale and that the other isn't finished yet. (OS4 ppl would probably do the same though, at least the die-hards)
Showing them together will just start new flame wars, new attacks from both parties,...
The only good comparison would have been OS4 on AOne and MorpOS on Pegasos.
And even then...there is no Amiga community anymore. There is a MorphOs crowd and an OS4 crowd. And both can't handle the fact that the other exists (which is kind of sad really). Very few people seem to be open for both systems.
I really don't see any point in MorpOS people going on and on about OS4, and OS4 ppl going on about MorphOS.
But sadly, looking at the forums, the situation is only getting worse.
So in short, it will be an unfair comparison which will lead to more of the same.
:-(