i don't know but some rules should still apply:
you have to grab the visitor quickly so put your best stuff first, this should be keyword rich.
the end goal is to keep the visitor isn't it?
homepage page load is important so short snippets rather then mountains of text is better.
a homepage that looks like a just text will bounce quickly IMO
short snippets allows you to put more variety on homepage relative to the subject giving you more keywords.
tim