Well I have done a bit of work this weekend on building updating ecommerce to use the new forms api. The store module is basically complete now. However I do need to refactor some of the methods of doing things such as the admin/store so that it can uses the new _validate() and _submit() functions to do the updating.
Using these will be a lot nicer that the current method.
I still need to find someone to convert the product module, this will need a large amount of refactoring esp because of how the wizard works. Maybe I should find out about the wizardapi that was created for the drupal installer. I do hope I can find someone as this is going to be a big change.