Learn Finnish: Nämä aloitteet arvioitaneen pian. - These initiatives will probably be evaluated soon.

For a Group 2 verb like arvioida, you can form the potential passive by taking the standard passive present arvioidaan and replacing the -daan with -taneen. The suffix -taneen is made up of the passive marker -ta-, the potential marker -ne-, and the passive personal ending -en.

What nuance does the potential mood add compared to just saying Nämä aloitteet arvioidaan pian?

While arvioidaan is a factual statement meaning the initiatives absolutely will be evaluated, the potential form arvioitaneen adds a layer of probability. It translates to they will probably be evaluated. This form is very common in formal contexts, like news broadcasts or official administrative reports, but is rarely used in everyday spoken Finnish.

Since nämä aloitteet is the object of the evaluation, why is it in the nominative plural instead of the partitive?

In Finnish passive sentences, total objects are put in the nominative case rather than the genitive-like accusative case used in active sentences. Because this is a plural total object, it takes the standard plural -t ending to become aloitteet. The partitive would only be used here if the action were explicitly ongoing or incomplete.

What is the base form of aloitteet and why does it have a double tt here?