The compatibility page for Nokia Medium Universal Pouch CP-594 shows something interesting.
There's a Note just below the heading that states:
Nokia Medium Universal Pouch CP-594 is compatible with Nokia 605, Nokia 305, Nokia 306, Nokia 311 and smaller phones of similar size.
Obviously, Nokia has not announced the 605, 305, 306 or the 311 so Someone went ahead of themselves and revealed this.
While at the same time, Someone was sharp enough to notice and spread the good word!
we already saw looked like a user manual photo of the Nokia 306 a couple of days ago from NokiaPort. I guess this latest revelation further confirms this phone, along with the 605, 305 and 311 is real!
The Nokia 605 will most probably be a successor to the Nokia Belle 603
While it will only make sense for the 305 306 and 311 to run on S40 OS, just like the 302 and 303.
But nothing is certain, they could very well run on yet to be revealed Meltemi!
Source: Nokia Accessories