One of the most dramatic changes looks to be the brake levers. Now I am aware that the current levers aren't a favourite to many but I haven't had a problem with them. These do look a great deal better and more ergonomic.
The grips have a colour change and I am not sure if the actual material of them has changed.
Another very big change is the chain set. Looks better doesn't it. Again a more modern and efficient design.
The rims get a makeover too and from what I have heard they will be double rimmed.
Looks as if there is a Brompton water bottle and I'm sure it has a clever way of attaching it to ones bike.
Lastly, the toolkit that fits ingeniously inside the tube and can be carried discretely as one rides happily along, looks set to be on sale soon - hopefully! I will probably get one at some point and knowing me not want to use it.
Exciting times. For those of use not upgrading to a new Brompton I am sure that all of these new parts will eventually be available to buy and retrofit - one of the great things about owning a Brompton.