Well, well, they really did call it SharePoint 2013.
There was me thinking that MS never touched that unlucky number.
First signs positive, doesn't seem to be as geared towards Windows 8 as I might have feared. Sensible move!
Download the preview here;
http://technet.microsoft.com/en-US/evalcenter/hh973397.aspx?wt.mc_id=TEC_121_1_33