It looks like Acer is among the names behind Ion systems as the presentation of Ion based Acer Hornet has already leaked out, but more important, Acer is not the only one.
Just like it happened ten years ago in 1999, when Intel didn’t allow Asus and others to put their names on the first Athlon motherboards, history repeat itself.
Big names, including Acer and many others, are scared of Intel’s reaction and despite the fact that they are developing Ion based products and are preparing to ship them in Q2 or a bit later, they are too scared of Intel's reaction in case they show it too early.
We also heard that many design wins are desktop/nettop based rather than notebook, but we are sure that there will be some notebooks with Ion inside, that will enable some basic gaming.
If you want to see Intel’s presentation against Ion, it is posted here.