Here is a proposed release schedule for 0.18.0, the next major release of Bitcoin Core. Like for previous major releases I've aimed for a release 6 months after the last (#12624).

2019-02-01 ✔️

• Open Transifex translations for 0.18
• Soft translation string freeze (no large or unnecessary string changes until release)
• Finalize and close translations for 0.16

2019-02-15 ✔️

• Feature freeze (bug fixes only until release)
• Translation string freeze (no more source language changes until release)

2019-03-01 ✔️

• Split off 0.18 branch from master
• Start RC cycle, tag and release 0.18.0rc1
• Start merging for 0.19 on master branch

2019-04-03 ✔️

• Release 0.18.0 final (aim)

If any specific dates or timeframes are a problem for you, let me know.