"I've heard it may be a few years before they can entomb the place in concrete and know things are finalised?"
They've now decided to scrap the plants but, as far as I know, haven't decided on exactly what they're going to do.
"What about dangers from the spent fuel rod pools? I thought that further radioactivity could 'leak' from the plant now and in the future? In short I've read we're not out of the woods yet."
That is a "danger" at any plant and is historically not much of a risk.
"What about other earthquakes etc in Japan at other sites? If there are unforeseen events at other nuclear plants do we have the know how to remedy the problem? It seemed that no one knew how to deal with the events at the Japanese plant, helicopters picking up buckets of water spring to mind."
Those plants had a lot go wrong with them.
They got hit by a massive earth quake, the area got hit by a Tsunami, the power failed, then the backup power failed and then the failures kept on for a period that the design couldn't quite cope with.
And that's a pretty unlikely set of events, and more modern plants are far better equipped to deal with it if it were to happen again. The Japanese are also now ordering that plans be put in place that will explicitly specify what will happen if those incredibly unlikely chain of events were to happen again.