The issue you are going to run in to is the system bus, which is still HSIC based from what I know of it. That means you are stuck sharing roughly 280Mbps of throughput after overhead is taken in to account.
That doesn't make for a very capable router unless you are only looking at a modest internet connection and not much going over it (also assuming that the CPU can actually keep up with routing ~280Mbps).
For wireless, the story is massively more grim. You'd be sharing that 280Mbps between wired and wireless, which means theoretical max is going to be more like 140Mbps (its a serial bus).
A 6 year old 11n router I tossed ages ago was faster than that. Of course then you have to take in to account the 10/100 port, which makes things slower.
The Pi 2 is not a good setup for an open router unless you are looking at very limited operating circumstances. Most any modern gigabit router is going to be massively faster, if for no other reason then a much more capable system bus.
Of course if the system bus on the Pi 2 ends up not being USB based like it is now, my tune might change a little.
Of course you'd still need to buy adapters for the thing, and 2 of them if you want concurrent dual band capability and you'd still be limited to USB2 throughput at best (which means no workable 802.11ac, or at least not fast 802.11ac).
I am very much looking forward to the Pi 2, but since I/O doesn't look like it has gotten warmed over, it doesn't improve its use cases all that much for networking/NAS usage. As a lightweight webserver it might be a lot more useful, for some home automation and some other light weight server use it might be a better candidate, but it is likely to only make a passable router if you have a lowish speed WAN connection and it would make a terrible wifi router.
You want a fast Wifi router or a fast router with low power consumption and tons of power? Buy a low end Intel NUC and add on a USB3 hub with requisit wifi adapters and an extra gigabit port. Maybe $300 for something massively capable (less if you go the Bay Trail NUC and lower still if you have a few extra parts like SODIMMs and/or drive laying around) and probably actually faster than most modern routers, for roughly the same price range as high end wifi routers and probably similar power consumption to high end consumer routers.
PS Unless Win10 is a lot different than Win8.1, it is not a great OS to roll your own server. Certainly not for your typical "I am not an advanced user" user that most people are. PFSense is a lot more user friendly for rolling your own router.
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