Source: This Week in Star Citizen
Relevant part:

We know many of you are making plans for Patch Day, so we want to give you a heads-up. With the release of Alpha 4.8, we'll be performing a wipe of in-game resources, items, vehicles purchased with aUEC, and earned aUEC balances.

This reset is an important step toward stabilizing the economy as various new systems come online. Alongside it, we've also introduced additional safeguards aimed at reducing the exploits and duplication issues that impacted the economy previously.

Here's what you'll keep:

• Vehicles obtained through Wikelo
• Blueprints
• Any item or vehicle entitled to your account (visible in the "My Hangar" section at robertsspaceindustries.com)

Additional clarification:

We want to clarify that the following will also be reset with Alpha 4.8:

• Reputation
• Executive Hangar ships
• Wikelo gear and items (excluding ships)

Update 2:

Alpha 4.8 will include a comprehensive wipe. This means earned aUEC, in-game purchased vehicles, items, resources, reputation progression, and Wikelo and Executive Hangar rewards will all be reset with the launch of Alpha 4.8.

Here’s what you will keep:

• Blueprints
• Any item or vehicle entitled to your account and visible in the "My Hangar" section of the RSI website