The stack of Microsoft tablet devices had high-end Intel Core processors hovering over ARM SoCs, the two separated by a simple “Pro” label (and Windows 8.x versus Windows RT). While the Pro line has been kept reasonably up to date, the lower tier has been stagnant for a while. That is apparently going to change. WinBeta believes that a new, non-Pro Surface will be announced soon, at or before BUILD 2015. Unlike previous Surface models, it will be powered by an x86 processor from Intel, either an Atom or a Core M.
This also means it will run Windows 8.1.
The article claims, somewhat tongue-in-cheek, that Windows RT is dead. No. But still, the device should be eligible for a Windows 10 upgrade when it launches, unlike the RT-based Surfaces. Whether that is a surprise depends on the direction you view it from. I would find it silly for Microsoft to release a new Surface device, months before an OS update, but design it to be incompatible with it. On the other hand, it would be the first non-Pro Surface to do so. Either way, it was reported.
The “Surface 3”, whatever it will be called, is expected to be a fanless design. VR-Zone expects that it will be similar to the 10.6-inch, 1080p form factor of the Surface 2, but that seems to be their speculation. That is about all that we know thus far.