The IDF has already started an investigation which was published in Harretz. After a US Veto, the UN, as a body, has no power. Individual states can do what they want, but do not count on the EU or Britian, Maybe some Asian states will?
Jordan foreign minister says to speak with Kerry on Israel-Palestinian conflict (Reuters)
from the article: Diskin to Abbas: Defer UN vote on Goldstone or face 'second Gaza'