I cant confirm anything on this new hero, but it seems like some beta map tester leaked this screenshot of a new hero named Alleria the Windrunner. This hero was suggested on dota allstars forum a while before.

Not many information is available on this new hero but it seems good to be true. A new female hero in dota??

Hero Name: Vereesa Windrunner, the Arch Ranger
Afilliation: Sentinel
Background: Vereesa Windrunner was an elven ranger during the aftermath of the Second War. She is the younger sister of Sylvanas Windrunner, who led the defense of Quel’thalas and would later become the Dark Lady of the Forsaken, and Alleria Windrunner, hero of the Second War. (Source:http://www.wowwiki.com/Vereesa_Windrunner)
The high temptress of the Silvermoon clan, Vereesa Windrunner commanded the valiant defense of the Elvish town of Silvermoon. Only to fall to the onslaught of the Orcish Horde. Vowing revenge she solemnly joined the Alliance. Where learning various unconviental techniques, trained so her shots are dealy accurate and lethal. (Source: M3Th0dz, thanks!!)
Hero Model: NE Archer

Abilities and Skills

Main Attribute: Ag

Base Stats:
STR: 17 + 1.6 per level
AGL: 22 + 2.5 per level
INT: 14 + 1.7 per level
total: 53 + 5.8 per level
Range = 550
Base Speed = 310

Note: She has lower than norm stats gain. This is to compensate her powerful spells and her range + movement speed.

info taken from : http://forums.dota-allstars.com

Btw, there seems to be a new item also, Phase Boots?

if all of this is true, we might going to be seeing it in the upcoming latest dota map.

Try checking on http://dota-allstars-blog.blogspot.com for new dota stuffs.