While I don't think it's beyond the realms of possibility for her to show up in a very minor role (this is a film series that has featured a reality tv clamper for goodness sake) that story smells, and the smell gets worse the further down you go.
Finnes singing KGB songs and riding a Harley barechested
As for a sex scene. Well they've already cast a girl to be Bond's girlfriend, and there's Severine and Eve, and I think we can assume he might have a dalliance with at least one of them, and possibly both. For all his womanising rep I'm wracking my brains trying to think of a film where 007 has slept with/clearly been involved with more than 3 girls.
The low mark is probably Quantum as he's only intimate with Fields, even for it's supposed 'new man' ethos The Living Daylights features two conquests.
Obviously he tried real hard to get as many as possible in OHMSS