Is there a possibility of the person being John?
Is there a possibility of the person being Bond?
Spoilers……………
it’s not bond! He was shocked himself when he saw that Sherlock was alive
Sorry I took a while to respond, but I don't think so.
-John's eyes are brown and on the darker side of the gradient in the manga.
-John is close to height with Holmes (179cm and 185cm). The man shown in the last few panels looks almost a head shorter than Sherlock.
Also their manerism and such are different from each other
1) That guy's not William. William never called Sherlock "Ponytail sensei" and his eye colour is completely different than Will's. Will's eyes used a dark grey gradient and are red (gradually became duller along with his will to live), while the man that appeared has eyes that aren't shaded and are bright.
2) Ties in with the man from number one; I'm assuming it's someone that helped Sherlock, and possibly William, escape to France. There's probably much more that man helped them with from afar.
3) I think that William is in a comatose state actually, due to both physical injuries and his state of mind at the time of his attempted death. He may come to in the next few chapters. If not comatose, probably not holding up too well mentally