I'd like to see the release of a new Victorian theme!
But this one should feature a few small houses or shops, rereleases of the vehicles (black cabriolet?) and the Victorian mansion in a new colour. (Something more pink/red like the pavilion in the wedding theme.) Simple expansion packs of Victorian soldiers would be great. If they'd want, they could use WWI troops...
... They won't do that.
But I'd love to see the Pickelhaube in a different colour, aswell as the return of the bearskin hats (or the complete Royal guard specials for that matter!) and the husar shakos. Also, a figure wearing a monocle should be included in this theme, both with and without a moustache!
I'd also like to see a Napoleonesque theme, which bases on bluecoat vs. redcoat action instead of pirates. The husar shako or a new shako could be produced aswell as backpacks. Castles and fortifications still existed and were used during this era, so these could make some great buildings aswell. The tudor houses from DS could be used in small civilian life sets from this period. And not to mention the large vessels Playmobil could create!
And of course the rerelease of certain rare and wanted specials such as the British Royal Guard etc.