I'm guessing with the reload we have the new selo's rhythmn of speed.. Of course, I did something silly and got Fleet of Foot so it's harder to isolate (Fleet of Foot is an AA that improves my selo's even more). If a non-fleet of foot bard can hop on (anyone I think above level 25 can help as this song doesn't have a movement formula), and help with testing this song and if it does indeed give a visible movement increase, that'd be good to know.
I'm seeing one issue I never have seen before, I need to sit down and test this more to ensure it's not just a bard-related fluke, but, if I give myself selo's, and click it off, my movement goes down to "base speed" for a moment, and then it goes back to a "little faster speed" as if I got a new buff but no buff is visible. I think this may be my runspeed being modified by AA's or something? It's in the gap of about a tick (less than 6 secs).
So to put it in example numbers, let's say selo's improves my movement by 90%. When I click off selo's, I go down to 20% movement. The next tick refresh my movement goes to 40%, it's a visible change as if it updated it to be faster. I'm not sure how long this lasts at the 40% status, I need to sit down and do more testing, ideally with two different boxes for comparison, or I think #showbuffs can actually measure my movement speed server side for calculation purposes..
Right now this is speculative information, it's 3am here and about to sleep, will test this more and run more analysis on it in comparison to classes without my AA's, and more direct comparisons of selo's indoor vs. sow, etc.
In regards to song working, I believe it is increasing more than movement speed of innate run 5, (visibly), which means it at least is using a new formula of some sort but I don't think it is beating SoW as is, or it's very close (that is around 50% movement). Once again, don't take my word just yet.. I plan to do more testing tomorrow when I'm not so sleepy.

This also gives time for Tyler to reply to me if the change wasn't added yet, so I won't spend too much time testing the process prior to it implemented. Haha.