SEBO could have in mind that the G1 and the BS36/46 series will be retired and replaced with the Evolution. It may even replace the 370 and 470 models too, as these are very similar to the BS36/46. At present, the UK lineup comsists of the BS36/46 and the Dart uprights for commercial use, and the Evolution would be a long awaited change for the stalwart BS36/46 whish has been running for a very long time. The Evolution comes in 3 head widths and looks similar to the BS36 so would fit in as the BS36 replacement in the UK.
As far as Domestic models is concerned, the X series is the oldest model now, with the K, D and Felix series all newer in design. It is only logical that the X series is updated now, but this model will be so hard to better. Storing the extension hose on board would be an idea, but would increase weight and possibly look untidy. All the X series was criticised for was the lack of independent brushroll control and the fact that machine tips over too easily when using the hose, so they may look at improving the stability of the machine when the hose is used. Any change to the X series domestic models would probably be carried on to the commercial XP series, if they are to retain the computerised height adjust.