sub-918 sportscar is not ready yet. In fact it needs at least 2 years of development until we see some mules.

So, Porsche can show us either some sub-918 design study or 550 as you predicted. In both cases it will be a joke since very high expectations are created by Press release as reginos correctly pointed out.

BTW, little info about new R8(some things are published today in Auto Bild which are accurate according to my source) V10 NA, at least 550ps and 7 speed DCT.