Hi,
Patches:
Let update Steam and then maybe install the beta-patch + Hotfix that is available here.
Other than that: We are waiting to see something this Friday like every Friday...
My personal guess: Patch this Friday, together with the anouncement of the next sequel.
Your system-specs would be useful. Maybe we can then tell you, if the game will run well.
Addons:
www.desastersoft.de has released great offline-addons, 1 of them is also available in english, the other one will be translated as well.
The quality of these add-ons are outstanding, they are even including a career-system.
For me personally the sim is well playable as long as i am not flying over londons rooftop. But there is still a hughe potential not beeing used by now.
it´s just that the complexity of the game doesn´t make it easier to develop it...