We have 236 votes at the moment and I doubt the proportions will change much from there.
Unsurprisingly, considering the history of the board, PC dominates. It might be helped by the fact that even PC that are three or four years old are still 'current' because of multiplatform development. The good chunk of people that plan to upgrade their PC soon (even if there is some overlap with people who own a currrent PC) shows that this PC dominance is here to stay. With a new generation of consoles out, it might be that multiplatform games will be upgraded to the point a number of older configs will no longer be 'current', but we can only guesstimate the numbers for that.
More of a surprise is the adoption rate of the PS4. The previous poll that was created just after a very lopsided E3 showed a very strong interest in the PS4, but one would have a thought that a launch line up devoid of 'must have' exclusives would have delayed most of the purchases, but already a quarter of the people who answered the poll own a PS4. I guess the wait between generations made the 'fresh new toy' effect outweighs the reasonable 'I'll wait for a game I want' approach (even if the lack of a foreseeable price cut in the system does not make that approach that much more reasonable). You know the effect is strong when one of the staunchest avocate for the 'wait and see' policy decided to upgrade early after all. Another quarter is planning on buying one soon (a chunk of those probably being people waiting for black friday deals), so in a few weeks/months there should be over 50% of PS4 owners.
After their catastrophic E3, Microsoft was in deep trouble. They changed their proposition in a major way to remove most of the things that customers disliked, but it does not seem it paid off that well. The current poll was created just after the Xbox One launch, but since the huge majority of purchases are done with pre-orders, I think it's fair to compare the numbers with those of the PS4. As it stands, both the 'own' and 'buy soon' numbers are at about a quarter of the PS4 numbers. On one hand it was to be expected because they still pay for E3 and the spiral of negativity that followed, but on the other, they managed to launch with a strong flagship exclusive in Forza (3rd biggest exclusive brand behind Halo and Gears of War while Killzone is the 5th - a Forza sells about 5 millions world wide and a Killzone a little under 3). Now, it might be that the members of this board are less into racing game than the average public. Another factor is that I am not sure what's the status of wheels compatibility between X360 and XB1 and what's available for XB1 at the moment when it comes to wheels.
As expected, the WiiU fares very poorly, but the upside for Nintendo is that the 'buy soon' category is on par with the XB1, probably thanks to a number of recent releases of key franchises that had a very warm welcome. It's unclear to me if the release of the new Mario just when the new consoles are released is a good or a bad idea (Bad: people want new shiny toys, not the 1 year old machine. Good: the best new game is on WiiU and the console is available), but it could save Nintendo's holiday season.
It will be interesting to see how different from the general public this board is. I suspect the US numbers should be kinder to the XB1 and to Nintendo (currently there is 1.7 million WiiU in North America for 1 million PS4, but we have three times more PS4 owners!).