Question to Ian and Remi on iSonic 145/155

[Jerome]

Measurements,shape, and out line of the new I-Sonic 145 et 155 seem to be exactly the same than the previous FT138 and FT148 features.
So i am wondering if they are the same boards with a new name (marketing) or do they benefit from some significant evolutions (if yes can you describe them) that Ican not distinguish only by looking at the drafts and the specs on the web site.
Cheers Jrome