Entitled "Horde 2.0 Briefing," the video goes over the ability to earn and use cash to buy Fortifications, both offensive and defensive, and how you can now trade weapons and cash with your teammates. Every 10th wave is also a boss wave that will require teamwork to properly survive.
Check out the video here or below, and note that the linked article also has a nice little written summary of what you'll be able to expect in Horde 2.0.
Very exciting! Horde was amazing in Gears of War 2, and it looks to be more robust than ever now!