Here are the few things I have read.
TN delegates made a pact they would only for Trump or Cruz. TX are going to be pro Cruz same as LA. AZ GOP leader said ALL the delegates would be very conservative, and he mentioned much in line with Cruz, and he specifically said they were not Pro-Kasich. I know what is happening in Iowa and they will be conservative. CO the same way.
I don't think the establishment will have much say at the convention in my opinion.
The one thing all the non-Trump delegates have in common, is, at this point, they don't want Trump.
I still think Cruz can win as he is not Trump.
It's not the 1237, but rather about the 270. It is the 270 electoral votes that matter, and considering that the Democrats benefit from a slightly increasing demographic advantage every 4 years, the Republicans/Conservatives need everything they can get. Unfortunately, they have formed a circular firing wagon and are going full blast with abandon.
Bottom line - if I could vote, 4 months ago I would have voted for Cruz, and right now I would vote for Trump. Either of those two would be better than Hillary ever could be. I wish more people would realize that.