Marketplace will be getting "World View" (previously known as Geo Selector) which will allow Marketplace users to browse and purchase applications from different geographic catalogs. Application prices will show up in the users local currently.
Microsoft will also be allowing Marketplace users to install applications downloaded from the Marketplace to their storage card.
Marketplace will also see a few changes with regards to independent software vendors (ISV), Marketplace. ISVs will no longer have to pay a $10 fee for submitting applications to additional markets. The ISV registration process is to be simplified by offering different registration paths based on the type of ISV (company, individual, student).
Marketplace will be expanding to the Russian market both for consumers and ISVs. Users in Russia will be able to access and purchase apps via credit card and ISVs will be able to register with Marketplace.
Lastly, changes are being made to existing Marketplace application acceptance to allow VoIP apps that use carrier networks unless there is a prohibition by a mobile carrier. Networks will be able to dictate if VoIP apps are acceptable on their networks.
You can find more information on these updates and changes at the Windows Mobile Developer Blog.