While we can’t be sure how well Garmin-Asus’ first Windows Mobile phone, the nuvifone M20, did in stores, it apparently did well enough to warrant a sequel. In addition to this morning’s announcement of the Android-powered nuvifone A50, Garmin has just announced that they’re also cracking away at a second WinMo phone.

Going against the grain, Garmin has decided to take a step backwards on the model number; though this one has improved specs across the board, the follow-up to the nuvifone M20 has been labeled the nuvifone M10. Confusing, right?

Names aside, here’s what we know so far:

• Display: 3.5″ Wide VGA (800×480) display
• Internal Memory: 512MB RAM, 512MB ROM
• Internal Storage: 4GB
• Operating System: Windows Mobile 6.5.3
• Battery: 1500mAh
• Camera: 5 megapixels
• Hardware features: Car charger and vehicle mount included

Like the A50, Garmin-Asus isn’t saying a peep about US availability or pricing, though they do say we can expect it to hit the shelves by the end of June in Asia and Europe.