TB993tt:
 

Are you thinking less power ? I thought so too since the A91 is supposed to be good for about 600PS structurally (that is based on tests done on the 997 A91)  but Porsche always like to give a bit more power than the older model so more than 620 - give us a clue yescool

It was mentioned here - GT2 RS will have some hybrid tech and total power of around 700 hp.