If you where expecting a Windows 8 app update (maybe the recent update to the in built People App, Mail, Calendar &Music App) but are not being offered it, then you can try forcing the app to be updated. Here is how:
Firstly open the Windows Store and go to settings in the charm bar
then select App Updates
Check for updates
Select which apps you want to update
press install and your apps should get updated
Get more help for Apps and the Windows Store
Thanks. Windows 8.1 aggh!