摘要显示：“Rivian doesn't disclose if the value of its $5.8 billion joint venture will expand as a result.” 关键信号：涉及 Rivian、TechCrunch；事件动作集中在 融资/估值/上市进展、AI/算力供需；出现 $5.8 billion 等可量化线索。 标题线索是：“Rivian expands joint venture with VW to include AI assistant”。 这条线索指向融资/估值/上市进展、AI/算力供需，重点属于融资/估值。 $5.8 billion 是后续判断规模、增速、价格或估值变化的关键数字。
公开来源中的事实
公开摘要：Rivian doesn't disclose if the value of its $5.8 billion joint venture will expand as a result
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