On the one hand, I think the large open areas of Selvadorada are encouraging that we could have a suitable world built for horse riding but I don't know if EA think there is enough demand for horses. I loved them in Sim3 and would buy them in a heartbeat. I think they feel they've done enough with pets though, what with an expansion and a pointless stuff pack. The only way I seem them happening is if we were to finally get a farm type expansion pack but I don't think we will - I think there are other iterations of packs they would want to produce versions of first such as Seasons and University.