Upgrading Wp-ecommerce and theme files

The plugin looks for these files in your theme first. You won’t want to override the theme files with the plugin files, as your theme developer has modified those files.

So as new updates come with wp-ecommerce these files in my theme will become outdated? I got a message that wpsc-user-log.php page had a bug. So would this file be ok to override in my theme?

Also it says WP e-Commerce is ready. If you plan on editing the look of your site, you should update your active theme to include the additional WP e-Commerce files. So does this move them to my theme?

These are the list of files that are in my theme folder and also show in wpsc-theme folder.
The developer said I don’t need to copy these over to my theme folder. But if wp-ecommerce updates files my theme will be out of date or might not work.
wpsc-cart_widget.php
wpsc-category_list.php
wpsc-category_widget.php
wpsc_defualt.css
wpsc-featured_product.php
wpsc-grid_view.php
wpsc-list_view
wpsc-products_page.php
wpsc-shopping_cart_page.php
wpsc-single_product.php
wpsc-transaction_results.php
wpscp-user-log.php