Yes, finally KAlgebra entered (with a dot hit🙂 to KDE edu’s playground with the intention to enter KDE edu in some way. I don’t know where KAlgebra is going to go, whether extragear or merged with Kmplot. If you want to try it, you’ll need cmake now and Qt4 as well of course. kdelibs4 is not still needed for KAlgebra, but for compiling the rest of playground/edu it is needed.
If you want to install it, you just have to install it as kde3to4 says or whatever you want. If you have any questions you can ask me here, by mail or by plane :).