The card is based on GM107 silicon, it is the first Maxwell-based 28nm core and as we said it will be the most power efficient of all Nvidia cores. In the latter part of 2014 we expect 20nm Maxwell chips that will deliver even better power efficiency (estimated 30 percent more power efficient compared to 28nm).
The same source claims that Nvidia will announce Maxwell on February 18th or at least at the same week. The usual suspects will launch the card including Asus, EVGA (4 SKUs), Zotac (2 SKUs), PNY one SKU, MSI two SKUs and finally Gigabyte. Most of these cards will end up in the €125 to €135 price range, excluding VAT which should land these cards at €150 to €160 Euro depending on the VAT rate in different European countries.
Some cards from EVGA are listed to cost much more, almost like, they will come with two GPUs on the same card but we believe that this might be a typo at the source or we will be very surprised. Depending on the manufacturer the cards will come with DVI, HDMI and DisplayPort, while some like Zotac come with 2X DVI, Mini HDMI, and DP. All cards without exception come with 2GB of GDDR5 memory.
You can get more details here.