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As for how to develop for them now, you can still spin up your own "testnet"-esque systems in the meantime using Mallet. Mallet supports IELE and KEVM.
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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Both of those have offline dev environments that you can pull down and play with at https://github.com/input-output-hk/plutus and https://github.com/input-output-hk/marlowe respectively. The upside is that the behaviour on-chain vs the behaviour in the testing environments should be identical due to the formal models constraining the behaviour.
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marlowe
Prototype implementation of domain-specific language for the design of smart-contracts over cryptocurrencies
Both of those have offline dev environments that you can pull down and play with at https://github.com/input-output-hk/plutus and https://github.com/input-output-hk/marlowe respectively. The upside is that the behaviour on-chain vs the behaviour in the testing environments should be identical due to the formal models constraining the behaviour.