There’s a new small tile size; you can fit four of those in the old Windows Phone 7 tile size.
The layout is completely flexible; press and hold the way you do on Windows Phone today and you can unpin a tile, drag it to a new position – or press the arrow that appears on the bottom of the tile to cycle through the small, large and medium sizes.
Even without the Zune-style ‘trough’ to remind you your other apps are on the right hand side, you only get two of what’s now the medium tiles side by side, but there seven rows of small size tiles (or three and a half medium tiles) so you could cram in 28 small tiles if you wanted to.
More likely, you’ll want a mix of small and medium tiles, with a couple of the ‘double-wide’ large tiles for apps that show a lot of information on a live tile.
That’s no longer restricted to Microsoft apps, phone makers and mobile networks; any app can have a double-side tile now, and it can be a live tile that updates.
If you make a tile smaller, the tiles next to it don’t move over automatically; if you make it larger, it does push the other tiles out of the way, so you may have to move tiles a couple of tiles to get the layout you want.
You can use small tiles to offset medium tiles (at the side or above) so you get a staggered arrangement instead of just grouping them in the space of one medium tile.
The new Start screen gives you even more live information because you can fit so many more live tiles on. You get more control than ever over which tiles get more space and which have just enough room to show their icon or the number of text messages or missed calls.
You can still have the Windows Phone 7-size tiles in two rows and the three new sizes and the underlying seven by eight layout give you much more flexibility.