Toshiba's AT200 may have only just launched, but the company is looking to be more aggressive in the tablet market in the future with several new releases. It's even looking at new screen sizes for inspiration, with both a 7.7-inch Tegra 3 Android tablet, which we saw at Mobile World Congress, and a massively girthed 13.3-inch concept device.And it's the latter that we got our hands on during the Toshiba 2012 conference in the UK.Sadly, the 13.3-inch monster - which we also understand will come with a Tegra 3 quad core processor if it ever becomes a consumer product \u00a0(or so we were told by Nvidia) - doesn't actually switch on at present. Therefore, while we got our greasy fingers all over it, and shot it from every angle, we can't confirm any of the meaty tech details.What we can say is that it is extremely light - no surprise considering its consumer-ready stablemate AT200 is currently the thinnest and one of the lightest Android 10.1-inch slates on the market. And it's not as cumbersome as you might expect.There's plenty of room for connectivity (naturally) and we can see several slots that we'd expect to make up USB, HDMI and SD card ports and slots. There's the presence of cameras rear and front, and the back plate design is very similar, if not identical, to its 7.7-inch counterpart.It's worth pointing out at this juncture that the Toshiba 13.3-inch tablet concept may never actually make it beyond non-working model. Pocket-lint was told by a Toshiba spokesperson that its future depends on consumer reaction. And if our own is anything to go by, that'll generally equate to a lot of pointing and mouths a-gape.Of course, this means that we have no idea on availability or cost, as neither does Toshiba at the moment. We're also not sure what screen technology will feature if it does make it to these shores. The 7.7-inch version has an AMOLED screen, but we'd find that very unlikely at this enormous size.The most surprisingly thing in our eyes, though, is that we can actually see a market for such a thing. If it remains as light as it is, that's considerably less weight than a similarly sized laptop or Ultrabook. We're not sure home consumers will buy into such a beast, but business applications would be obvious.Either way, Pocket-lint will bring you more info when Toshiba's trials are complete.