According to BGR India the Nokia Lumia 510 will be the first phone to ship with Windows Phone 7.8 from the start. BGR notes it comes with Bluetooth File Sharing and a Ring tone maker pre-installed.
The WVGA device with 256 MB RAM and 4 GB storage features a 5 megapixel camera and an 800 Mhz Cortex A5 processor.
Unfortunately Windows Pone 7.8 as an update will only arrive in early 2013, meaning the rest of us will have to wait, but soon for an increasing number of people this will be their only Windows Phone experience.
Thanks Arun for the tip.