the release counter points to both next releases. icinga core and web have been split into 2 projects regarding the relatively fresh and new development and versioning of the release (currently 1.0.1 vs 0.9.1 alpha).
for a general raodmap check:
https://dev.icinga.org/projects/roadmap/icinga-development
regarding the integration of nagvis, pnp4nagios or nconf there are plans for that. but if you have any feature requests or ideas, please add them to the dev tracker
https://dev.icinga.org/projects/icinga-web/issues