Sony Ericsson announced the Xperia mini and mini pro just recently and they were scheduled to hit the market in August. According to O2 though, the Xperia mini is going to launch this June in the UK.
So, in case O2 UK didn't make a big mistake, it seems the Xperia mini pro will become available quite ahead of its official release time frame making up for the delayed schedule of the Xperia PLAY launch. O2 UK has listed the phone as coming soon in June and you can bet it will go for free on a 2-year contract.
In case you've missed it, the Xperia mini pro is based on the same Snapdragon MSM8255 chipset as the Arc and Neo coming with a 1GHz Scorpion processor, Adreno 205 GPU and 512MB RAM. It features a 3-inch HVGA Reality display, 5 megapixel camera with 720p video recording, all the usual connectivity and a sliding-out QWERTY keyboard.
You can check the coming soon page on O2 UK from the source link below. It contains info on three upcoming devices - Sony Ericsson's Xperia PLAY and Xperia mini pro, as well as the Huawei G7010 feature phone.
Is Sony Ericsson Xperia Is Hangs?
I've seen this phone in Carphone Warehouse with availability on O2 (But it is the Carphone Warehouse O2 contracts that are available. These differ from the ones offered in the O2 stores). Carphone Warehouse have the actual handset working on display...
The O2 was updated with - "Coming Soon: September"