I expect to see Windows ARM binaries for open-source apps like Apache, MySQL, PHP, Netbeans, Gimp, Cygwin and so on. This will be the end of easy-development, toy-apps, currently made for tablets.
iOS's app distribution model has apparently been what has kept many open source applications from reaching the platform. Evidentially it's just not compatible with the terms of the GNU General Public License. This could also be a problem for Windows RT, which is similarly locked down to the "Windows Store".