In manga is refered that there are 4 separate tehniques in Shunpo
1.this is bond to ground (byakuya's attak from behind, attak that he used first time he meet ichigo)
"It's moust used between low lvl. shinigami's"
2.whit this you can stop in air and use it in wide battle (It's the moust wide used between shinigami's)(in this tehnic is normaly mention how good you are in shunpo "how far you get with one step")
3.this we only seen two time's in anime when yoruichi play tag with byakuya and in manga 299. (It's close to replaced tehnic, because something is left behind and give illusion of hitting the target)
4.If exist is something very powerful and fast (faster than ichigos ban-kai) and it look that only yoruichi master it with all tehniques before this. (It could be on same lvl. as kidou 90-99 whic aizen used)

WHAT DO YOU THINK?