An Access database that's hosted in this way can still be used locally on a desktop that has Access 2010 installed with all the rich functionality of Access, VBA, etc. The data is then hosted in SharePoint which exposes it to the web. So while it's not making it possible to publish an entire Access application with VBA to the web, at least a portion of it may be exposed with little to no additional effort. Letting people browse data, filter, and generate simple reports is all available and possible by non-programmers. It's a big step forward for the Access community.