This matches my personal experiences.
I am happy with having Arquillian integrated in Seam2 environment, manually. Working with Arquillian under AS7/Seam3/CDI works natively just fine.
I hope Seam 2 application can be packaged as JEE 6 packing structure...packaging all(EJB,etc) in war package instead of ear.
Of course, I assume I do not need distributed structure feature.
Seam2 works is soon to be released. Please give our developer branch a test and see if it works for you.
Supports test class enrichment of @In and auto packaging of the Seam libraries.
Thanks to Bartosz Majsak for the contribution!