Actually I was thinking the same thing as Starra, that she'll be the ace (alongside Tanapyon) of a new Kenshuusei (ok, egg) unit.
But I'll add something more. These new units are meant to replace Berryz/C-ute. For Berryz, it's been 10 years already and they're not getting any younger, they may want to try different things by themselves soon, so to add at least 2 new units seems the logical thing to do.
Anyway, I'm not sure whether Rikako's similarities to the AKB duo would be benefitial or not. It could bring some controversy that they're doing the cheap stuff by trying to cash in AKB's popularity. On the other hand, that could bring some new fans, but those very same people would be expecting something similar to AKB as well, which MM isn't. Also, UFP has shown to be a proud company (they won't allow mentioning AKB much... so having a look-alike in their main group seems a bit unlikely...)
(and sayaka akimoto has a nice body, but she's ugly as hell )