The current (issue 100) of Model Military International has a review of the forthcoming Tamiya 1/35 Mark IV; they got a pre-release copy of the kit. The magazine is in your local W.H.Smiths (assuming you have a local W.H.Smiths of course) and probably other newsagents.
First sight it looks good, though to me it looks as though there is too big a gap between the track links where they come over the front horns - however this may be because Tamiya are going to release it for radio control and need the play in the tracks? Also I think that the reviewer may have put one set of tracks on back to front as it looks as though the raised edge is on the rear of the track link on one side and the front on the other - but that may be the way they've photographed the kit!
Lots of crisp looking rivets and other details on the moulding, and it looks like it could be a nice kit
Next issue is supposed to be the painting and weathering stage...