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Or maybe more, I know they have yet to even think about developing the UI to handle groups on a raid level but surely the current UI could support groups of 10 players perhaps? 5 mans get old fast, and there are not enough cosmic bosses let alone challenging ones at that.
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As you say, there are already the cosmic world bosses (Grond, Kigatilik, Qwijibo, and others) that require more than 5 heroes. Also try some of the open quests, they often spawn a legendary foe. As for a 10 man instanced lair, I would be surprised if we saw that with the next major update, although the game has such a high population of lvl capped characters that maybe we will see a 10-man raid before too long.
Cryptic is trying a Customer Development approach to MMO creation.