Meteor-1.4 beta is now ready for running on ARM v7 and v8 (aarch64) architectures.
I finally have also built and included in the dev_bundle.tgz the node v.4.4.6-patched (will be replaced with next node v4 stable), the node-fibers v1.0.13-patched (will be replaced when patch comes to stable) and finally also a mongo r3.2.6 from their github.
As a test I run the simple-meteor-react example, with no issues
Question might be if we should invest additional effort into ARMv6 architecture (Raspi 1/A) - I will check via vote on Twitter.