AND , When will arm64 be released ?
There are no concrete dates for arm64 although it is being worked on. linux-arm is armhf. I don't think there are armel builds available but I may be wrong. @RussKeldorph @jkotas in case they know more.
Samsung has been publishing armel packages for Tizen: https://www.nuget.org/packages/runtime.tizen.4.0.0-armel.Microsoft.NETCore.App/
cc @alpencolt @gbalykov
Looks like the answer then is to use linux-arm for armhf and tizen-arm for armel for now. I'm going to close this issue. Let us know if you have other questions.