1) No significant changes in lenses. Some lenses will be updated, sharpness, overall IQ slightly improved. If we take a look how old current lenses are we will see that some of them were introduced 10 years or more ago. However, I would expect that Sigma and Tamron will be on the same level as Canon / Nikon. Canon / Nikon will loose quite significant share to Sigma and Tamron in lens area.
2) I would expect introduction of new sensors generation (also, I would not be surprised if Canon would stll use "old" sensors, i.e. introduced next year, even after 10 years)
3) All DSLRs will include wi-fi, GPS and some other features which are included in current P&S cameras
In 10 years I expect to see 2 additional generations of DIGIC processors, which will enable higher processing power required for high MP cameras. Semi-pro, pro cameras will have 40-60 MP (I do not think that Canon or Nikon will go so deep in medium format area and introduce 100 MP in FF cameras).
4) Hasselblad, Phase One and other MF companies will be bought by Canon, Nikon, or Sony. MF will still be used by professionals only, however, MF cameras and lenses prices will be much lower (but still not affordable to amateurs). What's a difference if cameras system costs not USD 50,000 but USD 30,000
5) In Canon rumours people will still be moaning that cameras should have better DR, should be able to cope with high ISO and require more megapixels. Many current CR forum members will be pensioners and will switch to mirrorless cameras as they are much lighter
6) Ken Rockwell will still be begging everybody for money but on a much higher scale (many Internet TV channels)