From this telesur article from December, the subjects are to be:

It was announced that the upcoming congress would focus on core issues of the country's economic and social life. The conceptualization of the economic and social development model and the implementation of the guidelines stand out. It will also analyze the party's functioning, its links with the masses, the ideological activity, and the situation of cadre politics. https://www.telesurenglish.net/news/Cuba-8th-Communist-Party-Congress-Convened-for-April-2021-20201202-0017.html

There has been a trend of more decentralization and giving more freedom for independent local cooperatives to form, but who knows, a reverse could be possible, but probably fairly unlikely.