Yes, W7 and W8 will have W10 as a free upgrade. Regarding tiles, W10 brings back the start menu, or something like that at least. When you press the start button, you won't shift on a tiles-only separated desktop, but a start menu with customizable tiles as well as the classic submenus from previous versions will pop up, traditionally, from the lower-left corner of the screen.
Personally, I really hate the idea of bringing back the old-fashioned menu model. Especially with a bunch of tiles crammed in it. Fortunately, though, you can switch to the W8 behavior.
I did not like the wasted space of the tiles. Just give me desktop icons.