There are no plans to include SE content at this time. The general view is a lot of that content broke balance pretty badly - not to say that we won’t revisit it at some point of course, however it’d need to be carefully considered in terms of how it would be implemented.
At this time there won’t be any major changes to combat systems though until we’re well and truly embedded with the changes in Britannia, we’ve had a chance to fix any bugs (bugs are part of life!) and ensure that a balance, or as close to our vision of balance at least, is achieved.
Thanks for your feedback!