DS1821+? Any new 8-bay synology's coming out in the near future?

[TastyCorn]

Thanks! Hypothetically speaking, do you think it would be possible to "upgrade" my arrays and put them into a new 8-bay synology when it comes out? Like, if I were to sell my 1821+ and buy a new model when it comes out? In the past, have there been any incompatibilities with CPU architecture or other changes between models (any size) that makes this process more complex than just swapping the drives to a new unit?

Thanks again, and, if you have any guides in general on swapping units that you can refer me to I'd appreciate it thanks!