Ewoks - Germany isn't switching to DVB-T - it did that many years ago.
It is, instead, switching from DVB-T to DVB-T2, and in the process switching from 576i25 MPEG2 encoding of the video services to 1080p50 H265 (and also allowing 720p50 and 540p50 H265) At the same time, many commercial services that were FTA unencrypted on DVB-T in SD are switching to an encrypted pay-TV option in HD (with the SD versions eventually being removed)
Because Germany is using DVB-T2 for modulation (same as many other countries are using with H264 compressioN) - any DVB-T2 USB tuner is likely to work with the FTA (free to air) broadcasts, but the encrypted stuff will be trickier. There are a number of USB DVB-T2 tuners on the market (though some of the very cheap ones don't have Linux drivers). August T210 v1 and v2 (and the equivalent Geniatech etc.), Pinnacle PCTV290e and 292e all work with DVB-T2, and with suitable backend software (TV Headend has support, and I would imagine Myth and VDR too) you just need a playback solution that copes. Sadly AIUI the Pi 3/CM3 don't currently have a working 1080p50 H265 decode chain - and it appears that we may be at the limit of what the Broadcom SoC they use can do.
(AMLogic S905/S905X boxes running LibreElec should cope fine - my ODroid C2 plays 2160/60p H265 from DVB-S2 via a SAT>IP tuner without skipping a beat)