NO WAY! We have received so much art (tons on last submission day 10/16/2016), there was no possible way to include it all. We will be previewing more and more art as the campaign goes on, so keep your eyes on the updates :)
While we have lots of art from professionals, we really wanted to get art from Undertale fans. We have pieces from artists at all level, ages, and from all over the world. We are aiming to really represent the Undertale fandom.
We are not sure yet, as even the campaign's success is not for sure. As we get closer to the end we will have a better idea of number since the printer has quantity blocks we have to print in, then we will know if there will be extra to sell following campaign. The only way to be sure this even happens is to back the campaign.