A handful of online sources have listed the new 27" Acer G-Sync monitor, which goes by the less-than-elegant product name XB270HAbprz. The original source appears to be Hermitage Akihabara, from Japan.
This is a Full HD (1920 x 1080) monitor, and Acer built it with a TN panel, which provides 170-degree horizontal viewing angles and 160-degree vertical viewing angles. The static contrast ratio is 1000:1, and it has a refresh rate of 144 Hz and a response time of just 1 ms. Given that this is a gaming monitor, we shouldn't be too surprised to see a TN panel rather than an IPS panel.
Nvidia G-Sync is a proprietary Nvidia technology which aims to remove screen tearing, stuttering and display lag. While you will need a G-Sync-compatible Nvidia graphics card and monitor to leverage the technology, it will result in a much smoother gaming experience at frame rates above roughly 30 FPS, depending on your level of sensitivity. Given that this is a 144Hz monitor with G-Sync support, we imagine that the experience will be butter smooth.
Regarding connectivity, this monitor only provides the basics. There is a single DisplayPort input and a USB 3.0 hub, and that's it. Hopefully there is more, but we can't find any reference to additional connectivity.
We also spotted the XB270HAbprz on the Dutch retailer Alternate, where it is listed for preorder for €499. Considering taxes and exchange rates, we would expect this one to cost about $499 in the US. Japanese availability is slated for August 22; we haven't been able to find any US release date information.