Welcome to Vodafone Community
There is a new market app out, version 3.5.15, great new feature is that once you log into your account it now shows all apps you have associated with that account, old and new, so when you need to reinstall any you can find all your old apps easily and install direct from your phone, no need for logging in to your PC and finding your apps that way.
it has been released as i have had it for over 10 days now
Just checked my version of Play Shop (Android Market) and it is version 3.4.4
As you say, it can be manually updated to 3.5.15
So I did, lol
New version with ALL Apps showing
facebook eat's your battery life aswell.
Go to Settings|About phone and the version number will be listed there. Depending on which model you have, this may only be the last version it was capable of running, rather than the absolute latest.