These aircraft borrow a lot of technology from the top-of-the-line G650(ER). In some cases, they top the G650, for example in the cockpit design.
Although Gulfstream says that these two new aircraft are additions to their product line and are not intended to replace the G450 and G550, I believe at least the days of the G450 are counted. If you read that the G500 will carry less fuel than the G450, but the G500 will fly 5000nm at M0.85, whereas the G450 flies 4220nm at M0.8. Moreover, the G500 has a cabin that is 2.5ft longer and 7 inches wider, providing a higher pressure in flight, making traveling more comfortable. Also, noise will be less, both out- and inside.
So I would not be surprised to see a run on these models comparable to the G650 when this aircraft was first announced. Production slots were sold every minute back then.
What will be the reaction from Bombardier. The G500 and G600 are clearly aiming at the Global5000 and Global 6000. We get a few hints when we search the Internet for the term "BR700NG": for example take a look here: GE is not the only one going for high tech ceramics in a business jet engine (the Passport 20 in this case). RR will also incorporate parts from this material in their BR700NG. And I am sure that
- the BR700NG will be the engine for an update of the Global 5000/6000
- that this update will be announced at the NBAA in Orlando next week