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One thing I would really like to see is a standard 3 man group. Im not saying that there should only be 3 man grouping, there should also be 6's and 9's but most should be tailored for 3. Since everyone will be responsible for themselves similar to guild wars two, I believe that the gameplay would be far superior with a reduced group size for the following reasons:
1) A three man unit will be much easier to "link" for 6 and 9 man adventures in ways you wouldn't expect. There could be a team working toward a goal while another team works on a second goal, and they end up working together to defeat the final boss. Theoretically you could have 20 teams working together (but separate) to unlock levers that lead to some chamber. You could also do it with one unit though it would take longer.
2) Mob strength and defences are relative to group size. In a game where your responsible for yourself a smaller groupsize means this will be more viable to implement. Larger group sizes increase the requirement for dedicated tanks, healers and dps. I believe that encounters would be far more fluid and fun if they used a 3 man structure, and the content is designed as such. It just reduces the fun when they have no choice but make the mobs hit extremely hard and have a billion hp just because you have 6 in your group.
3) A group of three is very easy to assemble. In my experience with older games such as eq and daoc ive always had the most fun in small 3 man groups. They are easy to form, easy to maintain, and easier to manage. You get a more personal experience this way with no dead weight players.
4) 3 man content is not out of the domain for either players who like to duo or solo, but it will increase the challenge providing more content overall for more players.