The following was actually released as part of alpha2 milestone.
Covers all instruments - counter, async counter, async gauge, histogram
Support both Delta and Cumulative temporality.
Docs for getting started with all instruments.
Prometheus exporter for counter, gauge, histogram.

(The below items from original plan, will be pushed to next release)

Updated:
Perf tweaks to avoid locks/allocs in hot path would be prioritized on alpha2.

Covers counter (async) version.
Adds basic Prometheus exporter
View support (scoped down to not allow Aggregator selection)