And here is what the Update does (Via Engadget) :
"Who says Microsoft ain't lookin' out for those who selected its
Zune HD over something Designed In Cupertino? Just days after countless owners went berserk over a
playcount syncing issue,
Microsoft has released a new firmware update that not only solves that
very quandary but also adds a gaggle of fantastic new and / or improved
features. The v4.3 update is available now by selecting "Player Update"
from within the device itself, and with it will come "support for
upcoming 3d games and applications, as well as an auto-suggest feature
for better text input, and other minor improvements." We're hearing
that those "minor improvements" include a snappier browser, so it's
pretty safe to say you're only harming yourself if you don't get this
download going right now."
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