What are the prominent upsides of the D programming language?

[mw]

On Wednesday, 23 September 2020 at 06:34:43 UTC, Paulo Pinto 
wrote:
> On Wednesday, 23 September 2020 at 04:04:04 UTC, mw wrote:
>> On Monday, 21 September 2020 at 11:04:43 UTC, Imperatorn wrote:
>>> Top reasons to use D instead of for example Rust, Julia, Go 
>>> etc :)
>>
>> [...]
>>
>> I think this flexibility to mix GC & manual memory management 
>> is very unique in D. Actually I'm not sure if it can be done 
>> in other languages at all.
>
> When Valhala/Panama finally get done, Java as well (Java 15 
> just got the first drop of this work).

Manual memory management option is on the road-map of Java 15? 
any reference? I googled a bit, but can't find any clue.