From the people who have voted so far for them I can't see much difference in the way of ideas and that they are a lot more to the left than they used to be.
Well, we need to wait for more SLD voters to see which direction they are likely to go.
It's a common problem in the centrist parties like SLD (despite it officially being centre-left, it has been pushed to the right more than the liking of some of its own members) and PUC that they tend to be internally divided between members who learn to the left and those to the right. The more leftist and rightist parties are much more stable internally because of this - you see very little conflict within PoP, PNL, CA and SN-RF.
Also the SN-RF behemoth will probably force a few of the right wing parties to join up as well, probably the PNL and POP. Right now that single party has more votes than all the right combined.
That's a possibility. Though it's a lot harder than people imagine for a couple of parties to work together harmoniously. It's evident in all of the previous alliance discussions.