yes it does provide landscape mode while reading ebooks and almost every thing else, the only things that wont go into landscape mode is the home screen and Apps page.
BUt you can download a FREE App that allows you to revolve all your screens any way you want and it's very fast and easy to do.
kindle ebook reader and web browser rotate by default along with every other Appp.
No rooting needed at all.
1
Ultimate rotation control -free version
If you don't like the home screen locked into portrait (see PHOTO 1) mode then there is a very simple answer to that and it does not involve changing the stock user interface.just download this App and UN-TICK in this Apps option setting -Enable per App settings. Also make sure in CURRENT ROTATION option sub folder FORCED AUTO is selected.