The Mothership are said to be about to launch a new F850, initially a GS I think but will doubtless spread across the lightweight range. Said to have a 270 crank to ape a V-twin, but accurate details are sparse.
That said, there is nothing much wrong with the existing 800 motor (360 crank). All early issues now seem sorted. Maybe not the most exciting power delivery, but does the job well, is reliable & very economical. Dare I say some even claim they prefer the baby GS to the R1200GS as a go anywhere machine, but I suspect the pricepoint might be the main influence.