You can do that in 4.0, We have introduce Localization concept
Switch > Localization here you have to set rules and Give it to your Provider from Accounts module, It will work same as 3.6

Could you please give an example? In my case, I have 5 trunks for one account. For each of them I need different callerid number translations (need to add few digits in front of the original number). These prefixes are not related to the destinations in my case. We're splitting different price/quality strategies with it.

Yup, I am having the similar issue with 4.0 for DNIS.
In case I have 2 trunks with 1 provider account, it's used to separate different level of routing/services (usually standard and premium), previously I can do it in "Trunks" - Number Translation for adding a tech prefix before send the call to the provider.
But in 4.0, seems I can have only 1 localization setting for 1 provider account, could you please advise how can I prepend tech prefix for 2 different trunks that belongs to the same provider account?
Should I do it in "termination rates" > "Prepend"? but it is not ideal way for me, tech prefix should always related to "Trunks" level.
Or should I create 2 provider account in this case? it is not ideal too....
Thanks.

Not sure about your scenario, But i have one suggestion for you,

In your provider's Rategroup you can select your those 2 trunk, might be it work for you.