Quick update for anyone interested. Got the shoes today. First impressions:
1. Sizing is smaller than Terrocs (for Terroc 330s I'm UK size 8.5, the Roclite 295 was definitely too small in 8.5, the size 9 was fine for me; normal "town" shoes I'm 8 or more often 8.5).
2. Design is very similar to Terrocs, except: different sole, different mesh (hopefully stronger!), different lining. Toe box is similar size to Terrocs.
3. Underfoot cushioning is greater, mainly down to a different footbed I think. Hopefully this will make for happier feet after a day of hard paths/tracks.
Comfy out of the box, as expected. I'm wearing them round the office today to make sure I like them 
Will try and remember to update this thread when I've had chance to test them in the great outdoors!