Currently Adobe Analytics Mobile Service is sending custom variable (evars,props) to AA report suite as showed below. During the migration from SDK 4 to AEP SDK, shall I migrated this part as well? Another question is: after the SDK migration, Adobe Mobile Service will handle the new AEP sdk?
To answer your query, you will need to migrate the processing rules to Analytics interface as mentioned here. As you are familiar with "props and eVars" in Analytics, you will notice that these variable names are not in the AEP SDK. All key/value data coming from the SDK will be sent as contextData variables , and as such will need to be mapped to props or eVars (or other variables) by using Processing Rules in the Analytics UI(Analytics> Admin> Report Suites > Edit Settings> General> Processing Rules).