汉译英：等我得到进一步的消息时我会马上通知你

Question

我想把如题的这句话用在邮件的结尾，请大家帮忙翻译英文应该如何表达，谢了。

Answer 1

I will inform you immediately when I get more informations.

Answer 2

I will let you know as soon as I get any further information.

Answer 3

I will keep you posted further develepment.

Answer 4

Any progress,I'll let you know.