Yesterday, open source foundation Mozilla announced a new partnership with Spanish startup  Geeksphone. The two companies are working together to build the first Firefox OS developer smartphones that will be sold to the public.

There are two different models planned: the lower-end Keon and the mid-range Peak. The Keon is coming first and will have specifications more in line with a contemporary feature phone than a smartphone, but this makes sense given Mozilla’s focus on building an OS that will be used in emerging markets.

Keon is powered by a single core 1 GHz Snapdragon S1 processor, with 512MB of RAM and 4GB of internal storage. This is augmented via micro SD, thankfully. Elsewhere, there is a single 3-megapixel camera on the rear, Wi-Fi N and HSPA cell connectivity. The 3.5-inch screen is quite low-grade as well, at a resolution of just 480 x 320 pixels.

Peak is a little more in line with what you’d expect from a mid-range Android smartphone. It’s got a dual-core Snapdragon S4 processor running at 1.2 GHz, but the same 512 MB of RAM and 4 GB of internal storage with micro SD should keep costs down. There are two cameras this time, 8 on the back and 2-megapixel on the front. The display is much improved, at 4.3-inches diagonally and with a qHD (960 x 540) resolution.

Keon should be arriving starting next month, while Peak has yet to be nailed down. The prices for either sim-free handset haven’t been precisely specified, but Geeksphone claim that they will be at a level that “you could never have imagined” – so that sounds pretty good.

What do you think of the proposed handsets? Do you have any interest in developing HTML 5 apps for the Firefox Mobile OS? Let us know in the comments below.