There is currently no way to add to a deployment package a modification to existing UI components (via AlterPage) for Tabs, Section and Lists once they've been added. Currently, if a UI component already exists, the package deployment does not update it even if it has changed.
For some components (like action groups) I have worked around this by removing the component in my deployment and then adding it back in. This is not possible, however for sections, lists or tabs as there is no Remove tag for these components.
I would want at least the ability to remove sections, lists and tabs so that I could replace them with new ones as part of a deployment. It would be nice, however if I could force an update of existing components with newer ones.