Going to first ten episodes, Gokaiger's previous super sentai power achieved = ..... 4 out of 34. This mean after 1/5 of show the rest of episode, suppose to do out the rest 30 tribute episode, which is still very possible. The four super sentai shown in the first ten episodes are : Magiranger, Dekaranger, Gekiranger and Gaoranger , which is also highly popular sentai of the 2000s.
Gokaiger now has footage of previous sentai from Goranger to Goseiger, with only ... hmm.. few haven't shown up, what I can remember is Bioman, Fivemen, Megaranger etc. The rest tribute costume are all faithfully original to the previous design, except for the trans-gender Yellow / Black ranger. See two samples of comparition: